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目的 探讨Krüppel样因子6(KLF6)高表达对于紫外线B(UVB)诱导晶状体上皮细胞(HLECs)凋亡的影响.方法 利用脂质体转染的方法将已成功构建的真核表达质粒pEGFP-C2-KLF6转染到HLECs中,采用Western blot法测定细胞中KLF6蛋白的表达水平;采用四甲基偶氮唑盐(MTT)法检测转染后细胞活力;经苏木精-伊红染色法观察细胞形态;采用Live/Dead染色法观察细胞受损情况;采用Westernblot法检测细胞中凋亡标志物bax和bcl-2的相对表达量,并计算bax/bcl-2比值;采用细胞凋亡检测试剂盒定量测定细胞凋亡水平,并检测细胞中活性氧簇(ROS)的表达水平. 结果 0.5 μg转染组和1.0 μg转染组细胞生存力较空载体对照组下降,差异均有统计学意义(均P＜0.05).KLF6高表达组细胞稀疏,细胞形态狭长,细胞质浓缩.正常对照组细胞形态稳定,数量均匀,为绿色活细胞;KLF6高表达组红色死亡细胞数量显著增多.UVB照射后,KLF6高表达组HLECs细胞凋亡值、bax相对表达量、bax/bcl-2比值、ROS表达量均高于空载体对照组,差异均有统计学意义(均P＜0.05). 结论 高表达的KLF6通过调控凋亡相关蛋白的表达及促进内质网内ROS堆积来加剧UVB照射导致的HLECs凋亡,提示KLF6参与HLECs的凋亡调控.通过生物学手段特异性下调KLF6的表达有可能在一定程度上发挥对HLECs的保护作用.“,”Objective To investigate the effect of the overexpression of Krüppel-like factor 6 (KLF6)towards the apoptosis of human lens epithelial cells (HLECs) induced by ultraviolet B (UVB) radiation.Methods The eukaryotic expression plasmid pEGFP-C2-KLF6 which was successfully constructed were transfected into HLECs,followed by the detection of KLF6 level by using Western blot,and then companied by UVB stimulation.Cell viability was measured by methyl thiazolyl tetrazolium (MTT) assay.The morphology of the cells was observed by using hematoxylin-eosin staining method.The cell damage was examined by Live/Dead staining.The apoptotic markers bax and bcl-2 were detected by Western blot.Quantitative apoptotic levels were measured with the apoptosis detection kit;the expression level of reactive oxygen species (ROS) was analyzed by DCFH-DA probe.Results The cell viability of the 0.5 μg transfection group and the 1.0 μg transfection group was significantly lower than that of the blank vector control group (both at P＜0.05).In high KLF6 expression group,the cells were sparse,long and narrow in size and shape,and the cytoplasm was concentrated.The cells in the normal control group were green living cells with stable morphology and even quantity.The number of red dead cells was increased significantly in the KLF6 highexpression group.After UVB irradiation,the apoptosis value,relative bax expression,bax/bcl-2 ratio and ROS expression of HLECs cells in the KLF6 high-expression group were all higher than those in the blank vector control group,with statistically significant differences between them (all at P＜0.05).Conclusions Overexpression of KLF6 can exacerbate apoptosis of HLECs caused by UVB,by regulating the expression of apoptosis-related proteins and promoting the accumulation of ROS in the endoplasmic reticulum.Down-regulation of KLF6 expression by biological tools may play a protective role on LECs to a certain extent.